Hi, I have a 2,26GHz 8 core cMP (MP4,1) with El Capitan. It's pretty classic, no SSD, standard GT120, 16GB of RAM. After seeing so many threads about upgrading the MacPro I'm thinking in some update, but first my use case. I use mostly CameraRAW (for RAW processing) and Photoshop (CS6). Converting the RAW files is relatively quick (it seems to uses most cores, and process more than 16 RAW files per minute). However, working with CameraRAW UI is slow, for example, changing from one file to another, the "warning" (indicating rendering is underway) sign on the top right corner stays on for about 1-2 seconds. Using Preview.app to show 5MPix JPEG resulting from RAW conversion, and then pressing the "down" arrow to scroll the list is advancing at around 3-4 pictures per second. When the images are smaller, it advances much faster. Anyway, I'm wondering what sort of upgrade (software/hardware) could increase responsiveness of the UI as stated above. Would a CPU upgrade help? From the (limited) testing above, it looks like more cores would get me faster RAW processing, but I'm not sure it would help with the UI sluggishness, whether it is CameraRAW (for RAW) or Preview.app (for JPEG). The RAW files are around 20MB, they are probably compressed. So a workflow that used some sort of cache could be a good improvement (does Lightroom has such caching?). I checked the speed of the (software) RAID array and it's clocking at around 400MB/sec R/W, so I doubt an SSD would help since read/write performance does not seems to be the bottleneck. Would a GPU upgrade help? I've read many articles on CS6, Photoshop and GPU and it looks like GPU support is limited to some specific filters. It does not look like they are decompressing/demosaicing the RAW files with the GPU. Would a RAM upgrade help? From what I read, it looks like after 32GB there's no increase in performance of several tools. What is your experience with Photoshop, CameraRAW and UI sluggishness? What does one needs to be able to change from one photo to another much quicker? Would upgrading from CS6 to CC help?